Beaches in the San Diego area are open after authorities suspended shark warnings posted when a swimmer was fatally attacked 150 yards offshore.

Solana Beach city spokesman Steve Didier said the beaches were busy Monday as surfers and swimmers ventured back into the water.

Record high temperatures over the weekend drew thousands to the coast from sweltering inland areas, but most stayed close to the water's edge as helicopters buzzed overhead keeping a watchful eye.

Sixty-six-year-old triathlete David Martin died Friday of blood loss after being bitten once by a shark, believed to be a great white about 15 feet long.

The shark has not been seen since. About 17 miles of coastline were closed after the attack.